It's probably just old blood that didn't pass while it was still bright red, but I would suggest having STD testing done if the consistency just doesn't seem right. It's usually the same consistency as regular menstrual blood, except often more clotted. Happens to me all the time, my period's all over the calendar.
i also wanted to add that i started a new diet last monday. so i've been on a new diet for 2 weeks and i've lost about 8 pounds. hope that helps